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<blockquote data-quote="WayneF" data-source="post: 385320" data-attributes="member: 12496">Yes, theoretically.&nbsp; &nbsp; If the DX sensor crops the FX lens view smaller, then DX sees less distortion and unsharpness in the far corner areas that its smaller crop did not reach and include.It is hard to assign absolute numbers generally, but for example, compare lens reviews at <a href="http://www.photozone.de/nikon--nikkor-aps-c-lens-tests" target="_blank">Nikon / Nikkor (APS-C) Lens Tests</a>Pick any FX lens, but for example, the 50mm f/1.8 D lens.On DX at f/1.8, it says 0.265% distortion, and 0.67 stops vignetting.On the FX review at f/1.8, it says 0.301% distortion, and 1.27 stops vignetting.Same lens, but the cropped DX sensor only sees a central area of the same lens, and does not see the extreme corners that FX sees.They changed methods, different tests at different times, but in resolution at f/5.6, the corners of DX are 89% of center, and FX corners are 81% of center.&nbsp; It is a farther reach to the FX corners.That is about the sensor, not the lens, but the DX lens is only designed to cover those closer cropped corners.</blockquote>

[QUOTE="WayneF, post: 385320, member: 12496"] Yes, theoretically. If the DX sensor crops the FX lens view smaller, then DX sees less distortion and unsharpness in the far corner areas that its smaller crop did not reach and include. It is hard to assign absolute numbers generally, but for example, compare lens reviews at [URL="http://www.photozone.de/nikon--nikkor-aps-c-lens-tests"]Nikon / Nikkor (APS-C) Lens Tests[/URL] Pick any FX lens, but for example, the 50mm f/1.8 D lens. On DX at f/1.8, it says 0.265% distortion, and 0.67 stops vignetting. On the FX review at f/1.8, it says 0.301% distortion, and 1.27 stops vignetting. Same lens, but the cropped DX sensor only sees a central area of the same lens, and does not see the extreme corners that FX sees. They changed methods, different tests at different times, but in resolution at f/5.6, the corners of DX are 89% of center, and FX corners are 81% of center. It is a farther reach to the FX corners. That is about the sensor, not the lens, but the DX lens is only designed to cover those closer cropped corners. [/QUOTE]

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